CN106823669A - The technique and its device of a kind of annealing furnace tail gas recycle purification - Google Patents
The technique and its device of a kind of annealing furnace tail gas recycle purification Download PDFInfo
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- CN106823669A CN106823669A CN201710086736.9A CN201710086736A CN106823669A CN 106823669 A CN106823669 A CN 106823669A CN 201710086736 A CN201710086736 A CN 201710086736A CN 106823669 A CN106823669 A CN 106823669A
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- 238000000137 annealing Methods 0.000 title claims abstract description 76
- 238000000034 method Methods 0.000 title claims abstract description 52
- 238000000746 purification Methods 0.000 title claims abstract description 34
- 239000007789 gas Substances 0.000 claims abstract description 262
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 75
- 238000001914 filtration Methods 0.000 claims abstract description 48
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 38
- 239000001301 oxygen Substances 0.000 claims abstract description 24
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 24
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 23
- 238000009833 condensation Methods 0.000 claims abstract description 18
- 230000005494 condensation Effects 0.000 claims abstract description 18
- 238000001179 sorption measurement Methods 0.000 claims abstract description 16
- 230000000087 stabilizing effect Effects 0.000 claims description 14
- 238000010438 heat treatment Methods 0.000 claims description 10
- 239000007788 liquid Substances 0.000 claims description 10
- 239000003463 adsorbent Substances 0.000 claims description 8
- 238000000926 separation method Methods 0.000 claims description 8
- 230000001502 supplementing effect Effects 0.000 claims description 6
- 238000012360 testing method Methods 0.000 claims description 4
- 239000013589 supplement Substances 0.000 claims description 3
- 238000011010 flushing procedure Methods 0.000 claims description 2
- 239000012535 impurity Substances 0.000 abstract description 33
- 239000000428 dust Substances 0.000 abstract description 32
- 239000000839 emulsion Substances 0.000 abstract description 32
- 239000010731 rolling oil Substances 0.000 abstract description 30
- 230000008901 benefit Effects 0.000 abstract description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 28
- 230000000694 effects Effects 0.000 description 23
- 239000001257 hydrogen Substances 0.000 description 14
- 229910052739 hydrogen Inorganic materials 0.000 description 14
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 13
- 230000006641 stabilisation Effects 0.000 description 8
- 238000011105 stabilization Methods 0.000 description 8
- 230000003139 buffering effect Effects 0.000 description 6
- 239000003921 oil Substances 0.000 description 6
- 230000000052 comparative effect Effects 0.000 description 4
- 239000000047 product Substances 0.000 description 4
- 230000000274 adsorptive effect Effects 0.000 description 3
- 239000007791 liquid phase Substances 0.000 description 3
- 239000003054 catalyst Substances 0.000 description 2
- 230000003197 catalytic effect Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000001035 drying Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000005202 decontamination Methods 0.000 description 1
- 230000003588 decontaminative effect Effects 0.000 description 1
- 230000001934 delay Effects 0.000 description 1
- 238000006392 deoxygenation reaction Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 238000011049 filling Methods 0.000 description 1
- 125000004435 hydrogen atom Chemical group [H]* 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 238000010926 purge Methods 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 239000004577 thatch Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
- B01D46/0002—Casings; Housings; Frame constructions
- B01D46/0012—In-line filters
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D5/00—Condensation of vapours; Recovering volatile solvents by condensation
- B01D5/0057—Condensation of vapours; Recovering volatile solvents by condensation in combination with other processes
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- B01D5/0057—Condensation of vapours; Recovering volatile solvents by condensation in combination with other processes
- B01D5/0072—Condensation of vapours; Recovering volatile solvents by condensation in combination with other processes with filtration
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- B01D53/002—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by condensation
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- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/005—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by heat treatment
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- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/02—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by adsorption, e.g. preparative gas chromatography
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/26—Methods of annealing
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/74—Methods of treatment in inert gas, controlled atmosphere, vacuum or pulverulent material
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/0006—Details, accessories not peculiar to any of the following furnaces
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- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2257/00—Components to be removed
- B01D2257/10—Single element gases other than halogens
- B01D2257/104—Oxygen
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Abstract
The invention discloses the technique and its device of a kind of purification of annealing furnace tail gas recycle.The technique comprises the following steps：(1) condensation process is carried out to annealing furnace exhaust gas, collects the first tail gas；(2) the first filtration treatment is carried out to first tail gas, the second tail gas is collected；(3) to nitrogen is supplemented in second tail gas, the 3rd tail gas is obtained；(4) the second filtration treatment is carried out to the 3rd tail gas, the 4th tail gas is collected；(5) the 4th tail gas is heated and deoxidation treatment successively, is collected the 5th tail gas；(6) adsorption treatment, collection and purification gas are carried out to the 5th tail gas.By above-mentioned technique and the device supporting with it; the impurity such as dust, emulsion, ROLLING OIL and oxygen in annealing furnace exhaust gas can effectively be removed; final purification gas meets the requirement of protection gas, can be directly entered in annealing furnace and be circulated utilization, with significant economic benefit and social enviroment protection benefit.
Description
Technical field
The invention belongs to tail gas disposal technique field, and in particular to the technique and its dress of a kind of annealing furnace tail gas recycle purification
Put, technique and its device that more particularly to a kind of continuous strip annealing furnace tail gas recycle decontamination cycle is utilized.
Background technology
The protection gas for being used in country's continuous annealing furnace at present is hydrogen and the mixed gas of nitrogen, and it is in the course of the work
Consumption and less, however, to ensure that pressure-fired in stove, it is necessary to be continuously passed through protection gas, to ensure equipment safety operation,
Prevent air from causing product quality defect into stove simultaneously.Hydrogen accounting is 5-8%, nitrogen in the protection gas for using at present
Accounting is 92-95%, by the protection gas of the proportioning can to annealing furnace in product to be annealed play and be effectively protected and reduce
Effect.
After annealing terminates, prior art typically by stove it is suitable for reading emptying pipeline be directly vented in air or
Burn, this mode can waste ample resources, increased cost, while also not meeting the requirement of energy-conserving and environment-protective.In order to be able to profit
With annealing furnace exhaust gas, after prior art is reclaimed, purifies, pressurizes using device for recovering tail gas to this part protection gas, again
Recycled into annealing furnace.As Chinese patent literature CN 104110972A disclose a kind of tail gas of furnace system of annealing
Reclaiming clean recycling device and technique.The device includes the adsorptive purifier, the circulation power that are sequentially connected by pipeline
Device, arrangement for catalytic purification or oxygen-eliminating device, the first cooler, moisture trap and sorption drying device, adsorptive purifier
Air inlet is connected with annealing furnace exhaust port, and the gas outlet of sorption drying device is connected with the air inlet of annealing furnace.Above-mentioned skill
Art realizes the purified treatment of annealing furnace exhaust gas and recycles to a certain extent, reduces energy consumption.
Because containing the impurity such as dust, oxygen, emulsion, ROLLING OIL and vapor in annealing furnace exhaust gas, in its reclaiming clean
During, it is necessary to effective removal wherein impurity, while wherein nitrogen and hydrogen is maintained in certain proportion, ability reusable edible,
Ensure the quality of product to be annealed.In above-mentioned technology, after tail gas is first processed through adsorptive purifier, eliminate to a certain extent
The impurity such as greasy dirt and dust, but, it is poor to the Impurity removal effect such as emulsion and vapor, and now tail gas is directly entered and urges
Deoxygenation is carried out in change purifier or oxygen-eliminating device, the impurity such as water vapour therein and emulsion can influence arrangement for catalytic purification or remove
The activity of catalyst in oxygen device, reduces deaerating effect；Furthermore, the ratio of nitrogen and hydrogen is not up to standard in the tail gas after purification, its
Annealing furnace is directly entered, the quality of product to be annealed in annealing furnace can be influenceed.
The content of the invention
Therefore, to be solved by this invention is that existing annealing furnace tail gas recycle purification technique and its device have impurity-eliminating effect
Tail gas after difference, purification is difficult to meet the defect of protection gas requirement, and then the tail gas provided after a kind of good impurity removing effect, purification is expired
The requirement of foot protection gas, the technique and its dress for being circulated the annealing furnace tail gas recycle purification for utilizing can be directly entered in annealing furnace
Put.
In order to solve the above technical problems, the technical solution adopted by the present invention is as follows：
The technique of annealing furnace tail gas recycle purification provided by the present invention, comprises the following steps：
(1) condensation process is carried out to annealing furnace exhaust gas, collects the first tail gas；
(2) the first filtration treatment is carried out to first tail gas, the second tail gas is collected；
(3) to nitrogen is supplemented in second tail gas, the 3rd tail gas is obtained；
(4) the second filtration treatment is carried out to the 3rd tail gas, the 4th tail gas is collected；
(5) the 4th tail gas is heated and deoxidation treatment successively, is collected the 5th tail gas；
(6) adsorption treatment, collection and purification gas are carried out to the 5th tail gas.
Preferably, the temperature of the condensation process is 3-16 DEG C.
Preferably, the filtering accuracy of first filtration treatment is 10-50 μm；
In step (4), the filtering accuracy of second filtration treatment is 5-10 μm.
Preferably, in step (3), to supplement nitrogen in second tail gas until the gauge pressure of the 3rd tail gas is 0.5-
2Kpa。
Preferably, in step (5), the temperature of the heating is 70-120 DEG C；
After through the deoxidation treatment, oxygen content ＜ 10ppm in the 5th tail gas.
Preferably, in step (6), dew point value≤- 65 DEG C of water content in the purified gas.
Further, after the step (2), before the step (3), also including by the gauge pressure of second tail gas
The step of voltage stabilizing is to 0.5-2Kpa；
Before second filtration treatment, also including the gauge pressure of the 3rd tail gas is boosted into 20Kpa-50Kpa's
Step；
After second filtration treatment, before the heating, also including carrying out gas-liquid to the 4th tail gas
The step of separation；
After the adsorption treatment terminates, also including carrying out the step of oxygen, nitrogen and dew point testing to the 5th tail gas
Suddenly；
After the test, also including the purified gas are carried out with the step in voltage stabilizing, then reuse to the annealing furnace.
Additionally, present invention also offers the device that above-mentioned technique is used, including condensing unit, the first mistake being sequentially communicated
Filter device, the first buffer unit, the second filter, heater, device for deoxidizing and adsorbent equipment, the condensing unit enter
Gas port is connected with the offgas outlet of the annealing furnace, and nitrogen supplementing mouthful is provided with first buffer unit.
Further, also including the first pressue device, its air inlet is connected with the gas outlet of first filter, its
Gas outlet connects with the air inlet of first buffer unit；
Second pressue device, its air inlet is connected with the gas outlet of first buffer unit, its gas outlet and described
The air inlet connection of two filters；
Gas-liquid separation device, its air inlet is connected with the gas outlet of second filter, and its gas outlet adds with described
The air inlet connection of thermal；
Making-up air device, its gas outlet connects with the nitrogen supplementing mouthful.
Further, also including the second buffer unit, its air inlet is connected with the gas outlet of the adsorbent equipment；
Stable-pressure device, its air inlet is connected with the gas outlet of second buffer unit, its gas outlet and the annealing furnace
Air inlet connection；
Oxygen tester, dew point tester and nitrogen tester, may be contained within connection second buffer unit and described
On the pipeline of annealing furnace.
Compared with prior art, the present invention has the advantages that：
(1) technique of the annealing furnace tail gas recycle purification that the embodiment of the present invention is provided, first condensation process tail gas makes wherein
Emulsion and ROLLING OIL be condensed into bulky grain, water vapor condensation for aqueous water removed while, emulsion, ROLLING OIL and liquid
State water can also wrap up in band and remove part dust in tail gas, collect the first tail gas；Then the first filtration treatment is carried out to the first tail gas,
The wherein larger dust of removal, and emulsion and ROLLING OIL are further removed, collect the second tail gas；Supplemented in the second tail gas again
Nitrogen, on the one hand serves the effect of buffering and voltage stabilizing, makes operation pressure stabilization, and device occurs without fluctuation, it is to avoid extraneous empty
The impurity such as gas enter in annealing furnace, reduce follow-up removal of impurities difficulty, improve follow-up impurity-eliminating effect, on the other hand have adjusted wherein nitrogen
With hydrogen ratio, the 3rd tail gas is collected；Then the second filtration treatment is carried out to the 3rd tail gas, wherein less dust is removed, and
Emulsion and ROLLING OIL are further removed, the 4th tail gas is collected, is removed by the two-stage of the first filtration treatment and the second filtration treatment
Dirt, effectively removes the dust of each particle size range, good dedusting effect；Then, the 4th tail gas is heated and deoxidation successively
Treatment, collects the 5th tail gas, the 4th tail gas is met deoxidation treatment requirement by heating, it is ensured that the effect of deoxidation treatment
Really；Adsorption treatment finally is carried out to the 5th tail gas, thoroughly to go conduct during water removal, collection and purification gas can be directly entered annealing furnace to protect
Shield gas.After tested, annealing furnace exhaust gas in dust clearance more than 99.99%, oxygen clearance more than 99.999%, impurity
More than 99.99%, the dew point value of water content reaches less than -65 DEG C to oily clearance.
(2) technique of the annealing furnace tail gas recycle purification that the embodiment of the present invention is provided, after step (2), step (3)
Before, the gauge pressure of the tail gas of voltage stabilizing second is to 0.5-2Kpa；Before the second filtration treatment, the gauge pressure of the 3rd tail gas that boosts is extremely
20Kpa-50Kpa；Timely supplement with nitrogen is adjusted by pressure twice, it is ensured that whole system is malleation, prevents air from entering
In system, while ensure tail gas pressure stability in technique, plant running stabilization；Gas-liquid separation is carried out to the 4th tail gas, one can be entered
Step removal liquid phase impurity therein, improves follow-up deoxidation effect；Whole technique has recycled tail gas, reduces production cost, reaches
The purpose of energy-conserving and environment-protective is arrived.
(3) device that the embodiment of the present invention is provided, using corresponding device and the order of connection, can effectively remove annealing furnace
The impurity such as dust, emulsion, ROLLING OIL and oxygen in tail gas, the tail gas after purification meets the requirement of protection gas, can be directly entered
Utilization is circulated in annealing furnace, with significant economic benefit and social enviroment protection benefit.
Brief description of the drawings
In order to illustrate more clearly of the specific embodiment of the invention or technical scheme of the prior art, below will be to specific
The accompanying drawing to be used needed for implementation method or description of the prior art is briefly described, it should be apparent that, in describing below
Accompanying drawing is some embodiments of the present invention, for those of ordinary skill in the art, before creative work is not paid
Put, other accompanying drawings can also be obtained according to these accompanying drawings.
Fig. 1 is the structural representation of annealing furnace tail gas recycle purifier in the embodiment of the present invention 1.
Reference is as follows：
1- annealing furnaces；2- condensing units；The pressue devices of 3- first；The filters of 4- first；The buffer units of 5- first；6-
Two pressue devices；7- making-up air devices；8- device for deoxidizing；9- heaters；10- adsorbent equipments；The buffer units of 11- second；12- gas
Liquid separating apparatus；The filters of 13- second；14- nitrogen testers；15- oxygen testers；16- dew point testers；17- voltage stabilizings
Device.
Specific embodiment
In order to the object, technical solutions and advantages of the present invention are better described, below in conjunction with specific embodiment to this hair
It is bright to be described further.The present invention can be embodied in many different forms, and should not be construed as limited to set forth herein
Embodiment.Conversely, there is provided these embodiments so that the disclosure will be thorough and complete, and will it is of the invention design fill
Divide and convey to those skilled in the art, the present invention will only be defined by the appended claims.
Embodiment 1
The technique for present embodiments providing the purification of annealing furnace tail gas recycle, comprises the following steps：
(1) to annealing furnace exhaust gas in condensation process is carried out at 10 DEG C, make wherein emulsion and ROLLING OIL be condensed into bulky grain,
Water vapor condensation for aqueous water removed while, emulsion, ROLLING OIL and aqueous water can also wrap up in band and remove tail gas middle part
Divide dust, collect the first tail gas；
(2) the first filtration treatment is carried out to the first tail gas, it is ensured that filtering accuracy is 30 μm, removes wherein larger dust,
And emulsion and ROLLING OIL are further removed, collect the second tail gas；
(3) to nitrogen is supplemented in the second tail gas, the 3rd tail gas is obtained, it is ensured that the gauge pressure of the 3rd tail gas is 1Kpa, on the one hand
The effect of buffering and voltage stabilizing is served, makes operation pressure stabilization, device occurs without fluctuation, it is to avoid the impurity such as outside air enters
In annealing furnace, follow-up removal of impurities difficulty is reduced, improve follow-up impurity-eliminating effect, on the other hand have adjusted wherein nitrogen and hydrogen ratio；
(4) the second filtration treatment is carried out to the 3rd tail gas, it is ensured that filtering accuracy is 8 μm, removes wherein less dust, and
Emulsion and ROLLING OIL are further removed, the 4th tail gas is collected；
(5) by the 4th tail gas in 100 DEG C heating, then through deoxidation treatment after, oxygen content ＜ 10ppm in the 5th tail gas, collect
5th tail gas；
(6) temp.-changing adsorption treatment, collection and purification gas are carried out to the 5th tail gas.
Above-mentioned purified gas are tested and calculated, is learnt：Dust clearance is in 99.99%, oxygen in annealing furnace exhaust gas
99.999%, 99.99%, the dew point value of water content reaches -65 DEG C to impurity oil clearance to clearance, in purified gas nitrogen and
The ratio of hydrogen is 95:8.
Embodiment 2
The technique for present embodiments providing the purification of annealing furnace tail gas recycle, comprises the following steps：
(1) to annealing furnace exhaust gas in condensation process is carried out at 3 DEG C, make wherein emulsion and ROLLING OIL be condensed into bulky grain,
Water vapor condensation for aqueous water removed while, emulsion, ROLLING OIL and aqueous water can also wrap up in band and remove tail gas middle part
Divide dust, collect the first tail gas；
(2) the first filtration treatment is carried out to the first tail gas, it is ensured that filtering accuracy is 10 μm, removes wherein larger dust,
And emulsion and ROLLING OIL are further removed, collect the second tail gas；
(3) to nitrogen is supplemented in the second tail gas, the 3rd tail gas is obtained, it is ensured that the gauge pressure of the 3rd tail gas is 2Kpa, on the one hand
The effect of buffering and voltage stabilizing is served, makes operation pressure stabilization, device occurs without fluctuation, it is to avoid the impurity such as outside air enters
In annealing furnace, follow-up removal of impurities difficulty is reduced, improve follow-up impurity-eliminating effect, on the other hand have adjusted wherein nitrogen and hydrogen ratio；
(4) the second filtration treatment is carried out to the 3rd tail gas, it is ensured that filtering accuracy is 5 μm, removes wherein less dust, and
Emulsion and ROLLING OIL are further removed, the 4th tail gas is collected；
(5) by the 4th tail gas in 120 DEG C heat, then through deoxidation treatment after, oxygen content ＜ 10ppm in the 5th tail gas, collect
5th tail gas；
(6) temp.-changing adsorption treatment, collection and purification gas are carried out to the 5th tail gas.
Above-mentioned purified gas are tested and calculated, is learnt：Dust clearance is in 99.99%, oxygen in annealing furnace exhaust gas
99.999%, 99.99%, the dew point value of water content reaches -65 DEG C to impurity oil clearance to clearance, in purified gas nitrogen and
The ratio of hydrogen is 92:5.
Embodiment 3
The technique for present embodiments providing the purification of annealing furnace tail gas recycle, comprises the following steps：
(1) to annealing furnace exhaust gas in condensation process is carried out at 16 DEG C, make wherein emulsion and ROLLING OIL be condensed into bulky grain,
Water vapor condensation for aqueous water removed while, emulsion, ROLLING OIL and aqueous water can also wrap up in band and remove tail gas middle part
Divide dust, collect the first tail gas；
(2) the first filtration treatment is carried out to the first tail gas, it is ensured that filtering accuracy is 50 μm, removes wherein larger dust,
And emulsion and ROLLING OIL are further removed, collect the second tail gas；
(3) to nitrogen is supplemented in the second tail gas, the 3rd tail gas is obtained, it is ensured that the gauge pressure of the 3rd tail gas is 0.5Kpa, a side
Face serves the effect of buffering and voltage stabilizing, makes operation pressure stabilization, and device occurs without fluctuation, it is to avoid the impurity such as outside air enters
Enter in annealing furnace, reduce follow-up removal of impurities difficulty, improve follow-up impurity-eliminating effect, on the other hand have adjusted wherein nitrogen and hydrogen ratio
Example；
(4) the second filtration treatment is carried out to the 3rd tail gas, it is ensured that filtering accuracy is 10 μm, removes wherein less dust,
And emulsion and ROLLING OIL are further removed, collect the 4th tail gas；
(5) by the 4th tail gas in 70 DEG C heat, then through deoxidation treatment after, oxygen content ＜ 10ppm in the 5th tail gas, collect
5th tail gas；
(6) temp.-changing adsorption treatment, collection and purification gas are carried out to the 5th tail gas.
Above-mentioned purified gas are tested and calculated, is learnt：Dust clearance is in 99.99%, oxygen in annealing furnace exhaust gas
99.999%, 99.99%, the dew point value of water content reaches -63 DEG C to impurity oil clearance to clearance, in purified gas nitrogen and
The ratio of hydrogen is 92:8.
Embodiment 4
The technique for present embodiments providing the purification of annealing furnace tail gas recycle, comprises the following steps：
(1) to annealing furnace exhaust gas in condensation process is carried out at 5 DEG C, make wherein emulsion and ROLLING OIL be condensed into bulky grain,
Water vapor condensation for aqueous water removed while, emulsion, ROLLING OIL and aqueous water can also wrap up in band and remove tail gas middle part
Divide dust, collect the first tail gas；
(2) the first filtration treatment is carried out to the first tail gas, it is ensured that filtering accuracy is 20 μm, removes wherein larger dust,
And emulsion and ROLLING OIL are further removed, collect the second tail gas；
(3) by the pressure stability of the second tail gas in 1Kpa；
(4) to nitrogen is supplemented in the second tail gas, the 3rd tail gas is obtained, it is ensured that the gauge pressure of the 3rd tail gas is 1.5Kpa, a side
Face serves the effect of buffering and voltage stabilizing, makes operation pressure stabilization, and device occurs without fluctuation, it is to avoid the impurity such as outside air enters
Enter in annealing furnace, reduce follow-up removal of impurities difficulty, improve follow-up impurity-eliminating effect, on the other hand have adjusted wherein nitrogen and hydrogen ratio
Example；
(5) gauge pressure of the 3rd tail gas is boosted into 30Kpa；
(6) the second filtration treatment is carried out to the 3rd tail gas, it is ensured that filtering accuracy is 5 μm, removes wherein less dust, and
Emulsion and ROLLING OIL are further removed, the 4th tail gas is collected；
(7) gas-liquid separation is carried out to the 4th tail gas, further removes liquid phase impurity therein；
(8) by the 4th tail gas in 110 DEG C heat, then through deoxidation treatment after, oxygen content ＜ 10ppm in the 5th tail gas, collect
5th tail gas；
(9) temp.-changing adsorption treatment, collection and purification gas are carried out to the 5th tail gas.
(10) during purified gas are carried out with voltage stabilizing, then reuse to annealing furnace.
Above-mentioned purified gas are tested and calculated, is learnt：Dust clearance is in 99.99%, oxygen in annealing furnace exhaust gas
99.999%, 99.99%, the dew point value of water content reaches -65 DEG C to impurity oil clearance to clearance, in purified gas nitrogen and
The ratio of hydrogen is 95:5.
Embodiment 5
Annealing furnace tail gas recycle purifier is present embodiments provided, as shown in figure 1, including the condensing unit being sequentially communicated
2nd, the first filter 4, the first buffer unit 5, the second filter 13, heater 9, device for deoxidizing 8 and adsorbent equipment 10,
The air inlet of condensing unit 2 is connected with the offgas outlet of annealing furnace 1, and nitrogen supplementing mouthful is provided with the first buffer unit 5.As
Selectable implementation method, in the present embodiment, condensing unit 2 can specifically use pipe heat exchanger；First filter 4 is specific
Block form filter can be used；First buffer unit 5 can specifically use surge tank；Second filter 13 specifically can be using arranged side by side
Formula filter；Heater 9 can specifically use anti-explosion heater；Device for deoxidizing 8 specifically can be using the tower of internal catalyst filling
Formula degasifier；Adsorbent equipment 10 can specifically use the telescopic tower with interior heating, in the present embodiment, can be filled using temp.-changing adsorption
Put, 4 series connection adsorption towers are operated and regenerate successively, it is ensured that the continuity of production.
In above-mentioned reclaiming clean device, by using said apparatus and the corresponding order of connection, annealing furnace 1 can be effectively removed
The impurity such as dust, emulsion, ROLLING OIL and oxygen in tail gas, the tail gas after purification meets the requirement of protection gas, can be directly entered
Utilization is circulated in annealing furnace 1, with significant economic benefit and social enviroment protection benefit.
In order to ensure tail gas pressure stability in technique, plant running stabilization, it is to avoid the impurity such as outside air enters annealing furnace 1
In, follow-up removal of impurities difficulty is reduced, follow-up impurity-eliminating effect is improved, also including the first pressue device 3, its air inlet and the first filtering are filled
4 gas outlet connection is put, its gas outlet connects with the air inlet of the first buffer unit 5；As selectable implementation method, at this
In embodiment, the first pressue device 3 concretely roots blower.
Second pressue device 6, its air inlet is connected with the gas outlet of the first buffer unit 5, and its gas outlet is filtered with second
The air inlet connection of device 13；As selectable implementation method, in the present embodiment, the first pressue device 3 concretely sieve
Thatch blower fan.
In order to further remove liquid phase impurity therein, follow-up deoxidation effect is improved, also including gas-liquid separation device 12, its
Air inlet is connected with the gas outlet of the second filter 13, and its gas outlet connects with the air inlet of heater 9.As optional
Implementation method, in the present embodiment, the concretely whirlwind separator of gas-liquid separation device 12；
In order to buffer purge gas pressure and stablize tail gas into the pressure in annealing furnace 1, also including the second buffer unit
11, its air inlet is connected with the gas outlet of adsorbent equipment 10；Used as selectable implementation method, in the present embodiment, second delays
The concretely surge tank of flushing device 11.
Stable-pressure device 17, its air inlet is connected with the gas outlet of the second buffer unit 11, and its gas outlet is entered with annealing furnace 1
Gas port is connected, as selectable implementation method, in the present embodiment, the concretely Self-pressure stabilizing valve of stable-pressure device 17.
On the basis of above-mentioned technical proposal, also including making-up air device 7, its gas outlet connects with nitrogen supplementing mouthful, as
Selectable implementation method, in the present embodiment, the concretely air supply tank of making-up air device 7；
Oxygen tester 15, dew point tester 16 and nitrogen tester 14, may be contained within connecting the He of the second buffer unit 11
On the pipeline of annealing furnace 1.
Comparative example 1
This comparative example provides the technique of annealing furnace tail gas recycle purification, comprises the following steps：
(1) the first filtration treatment is carried out to annealing furnace exhaust gas, it is ensured that filtering accuracy is 30 μm, removes wherein larger powder
Dirt, and emulsion and ROLLING OIL are further removed, collect the first tail gas；
(2) to nitrogen is supplemented in the first tail gas, the second tail gas is obtained, it is ensured that the gauge pressure of the second tail gas is 1Kpa, on the one hand
The effect of buffering and voltage stabilizing is served, makes operation pressure stabilization, device occurs without fluctuation, it is to avoid the impurity such as outside air enters
In annealing furnace, follow-up removal of impurities difficulty is reduced, improve follow-up impurity-eliminating effect, on the other hand have adjusted wherein nitrogen and hydrogen ratio；
(3) the second filtration treatment is carried out to the second tail gas, it is ensured that filtering accuracy is 8 μm, removes wherein less dust, and
Emulsion and ROLLING OIL are further removed, the 3rd tail gas is collected；
(4) by the 3rd tail gas in 110 DEG C of heating, then deoxidation treatment is carried out, collects the 4th tail gas；
(5) temp.-changing adsorption treatment, collection and purification gas are carried out to the 4th tail gas.
Above-mentioned purified gas are tested and calculated, is learnt：Dust clearance is in 50%, oxygen removal in annealing furnace exhaust gas
40%, 38%, the dew point value of water content reaches -30 DEG C to impurity oil clearance to rate.
Comparative example 2
This comparative example provides the technique of annealing furnace tail gas recycle purification, comprises the following steps：
(1) to annealing furnace exhaust gas in condensation process is carried out at 10 DEG C, make wherein emulsion and ROLLING OIL be condensed into bulky grain,
Water vapor condensation for aqueous water removed while, emulsion, ROLLING OIL and aqueous water can also wrap up in band and remove tail gas middle part
Divide dust, collect the first tail gas；
(2) the first filtration treatment is carried out to the first tail gas, it is ensured that filtering accuracy is 20 μm, removes wherein larger dust,
And emulsion and ROLLING OIL are further removed, collect the second tail gas；
(3) the second filtration treatment is carried out to the second tail gas, it is ensured that filtering accuracy is 5 μm, removes wherein less dust, and
Emulsion and ROLLING OIL are further removed, the 3rd tail gas is collected；
(4) by the 3rd tail gas in 110 DEG C of heating, then deoxidation treatment is carried out, collects the 4th tail gas；
(5) temp.-changing adsorption treatment, collection and purification gas are carried out to the 4th tail gas.
Above-mentioned purified gas are tested and calculated, is learnt：Dust clearance is in 40%, oxygen removal in annealing furnace exhaust gas
52%, 52%, the dew point value of water content reaches -28 DEG C to impurity oil clearance to rate.
Obviously, above-described embodiment is only intended to clearly illustrate example, and not to the restriction of implementation method.It is right
For those of ordinary skill in the art, can also make on the basis of the above description other multi-forms change or
Change.There is no need and unable to be exhaustive to all of implementation method.And the obvious change thus extended out or
Among changing still in the protection domain of the invention.
Claims (10)
1. a kind of technique of annealing furnace tail gas recycle purification, comprises the following steps：
(1) condensation process is carried out to annealing furnace exhaust gas, collects the first tail gas；
(2) the first filtration treatment is carried out to first tail gas, the second tail gas is collected；
(3) to nitrogen is supplemented in second tail gas, the 3rd tail gas is obtained；
(4) the second filtration treatment is carried out to the 3rd tail gas, the 4th tail gas is collected；
(5) the 4th tail gas is heated and deoxidation treatment successively, is collected the 5th tail gas；
(6) adsorption treatment, collection and purification gas are carried out to the 5th tail gas.
2. technique according to claim 1, it is characterised in that in step (1), the temperature of the condensation process is 3-16
℃。
3. technique according to claim 1 and 2, it is characterised in that in step (2), the filtering of first filtration treatment
Precision is 10-50 μm；
In step (4), the filtering accuracy of second filtration treatment is 5-10 μm.
4. the technique according to any one of claim 1-3, it is characterised in that in step (3), in second tail gas
Supplement nitrogen is until the gauge pressure of the 3rd tail gas is 0.5-2Kpa.
5. the technique according to any one of claim 1-4, it is characterised in that in step (5), the temperature of the heating
Spend is 70-120 DEG C；
After through the deoxidation treatment, oxygen content ＜ 10ppm in the 5th tail gas.
6. the technique according to any one of claim 1-5, it is characterised in that aqueous in the purified gas in step (6)
Dew point value≤- 65 DEG C of amount.
7. the technique according to any one of claim 1-6, it is characterised in that after the step (2), the step
(3) before, also including by the gauge pressure voltage stabilizing of second tail gas to 0.5-2Kpa the step of；
Before second filtration treatment, also including the gauge pressure of the 3rd tail gas is boosted into 20Kpa-50Kpa the step of；
After second filtration treatment, before the heating, also including carrying out gas-liquid separation to the 4th tail gas
The step of；
After the adsorption treatment terminates, also including carrying out the step of oxygen, nitrogen and dew point testing to the 5th tail gas；
After the test, also including the purified gas are carried out with the step in voltage stabilizing, then reuse to the annealing furnace.
8. the device that the technique any one of claim 1-7 is used, it is characterised in that including the condensation being sequentially communicated
Device, the first filter, the first buffer unit, the second filter, heater, device for deoxidizing and adsorbent equipment, it is described
The air inlet of condensing unit is connected with the offgas outlet of the annealing furnace, and nitrogen supplementing is provided with first buffer unit
Mouthful.
9. device according to claim 8, it is characterised in that also include,
First pressue device, its air inlet is connected with the gas outlet of first filter, and its gas outlet is slow with described first
The air inlet connection of flushing device；
Second pressue device, its air inlet is connected with the gas outlet of first buffer unit, its gas outlet and second mistake
Filter the air inlet connection of device；
Gas-liquid separation device, its air inlet is connected with the gas outlet of second filter, and its gas outlet and the heating are filled
The air inlet connection put；
Making-up air device, its gas outlet connects with the nitrogen supplementing mouthful.
10. device according to claim 8 or claim 9, it is characterised in that also include,
Second buffer unit, its air inlet is connected with the gas outlet of the adsorbent equipment；
Stable-pressure device, its air inlet is connected with the gas outlet of second buffer unit, and its gas outlet is entered with the annealing furnace
Gas port is connected；
Oxygen tester, dew point tester and nitrogen tester, may be contained within connecting second buffer unit and the annealing
On the pipeline of stove.
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